abirdcall
(she/her)
Yes. People saying "just attack the downed PCs" are missing the point by a mile.
Chosing not to hit the downed PC pretty much guarantees his survival. On the other hand, if the DM do chose to hit the downed PC, it's guaranteed that they will die.
Killing a PC is now left to DM fiat. That's the real problem here.
That isn't what that means.
The DM can also choose to have the enemy creatures pass all their actions. That doesn't mean the entire fight is 'DM fiat'.
I agree with the posters who say 'tactics' are the largest factor of difficulty.
If all enemy creatures are played like zombies then yes the game is easy. For example, I see people on message boards talk about a 'front line' a lot but there is not actually such a thing in a regular party. It is easy for monsters to just walk around PCs in most cases.